Why is Wi-Fi 6 Better for our WLAN Designs?

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RF Spectrum for Wi-Fi

let’s do a comparison

In today’s training video will be comparing the

spectrum across the bands

2.4, 5 gig and 6 gig

we’re not going to go talking about the

900 MHz or some of the other IoT bands.

We’re just focusing on 2.4, 5 gig and 6

as we look at this chart

it looks a little overwhelming

there is lots and lots of bandwidth

it’s big

it’s filled on the screen

so instead of looking at as a whole

which we could as you look at as a whole

there’s a lot going on there

let’s zoom up into the right corner and look

just at the difference in bandwidth

how much bandwidth do we have in 2.4 gig

we have only 80 MHz to play with

80 MHz

it sounds like a lot until you

realize it’s really only three channels

we only have three channels of non overlapping

frequency to use in two to four

Nice great

and 20 years ago is fantastic

we did everything else

we then moved up to 5 GHz with about

500 MHz

and we’ve used that for the last decade or more

and that’s really where our growth has been going

but with 6 gig in the future

we’re picking up an extra twelve hundred MHz

more space more than double what we’ve had so far

so yeah zooming in there

it’s great to see that we’re getting that much more spectrum

that means Wi-Fi can be more efficient

we can use wider channels

you get faster throughputs all the way around

no one to zoom in on just the size we’ve seen

this and the other videos about

2.4, 5 gig and 6

2.4 bigger waves

five gig smaller six gig even smaller

we have a little room that you can compare those to

if we go in the upper left corner and we now

see that there’s just three channels

wwe talk specifically about 2.4

we showed all the thirteen channels

but really there’s only three that we can use cleanly

without adjacent channel interference and we really

don’t like adjacent channel interference

the problem with three is that forces us to be

in many situations in where we have

cochannel interference

two more APs on the same channel above a noise floor

if it’s above the noise floor where there’s a

preamble detect

if I detect your preamble I will wait and defer

that means 2 APs on the same channel

above the preamble effect

you have the capacity of one because they both

wait for each other

the protocol is very polite

if you’re talking I’m going to wait for you

thus the 2.4 problem is we don’t have enough

frequency to go there

the other issue is because as a wider bigger wavelength

that means the received aperture on

the devices that are listening will collect

more information

meaning they can be further

away from an AP and still hear it enough to be

in its preamble detect

so the contention domain the size of how it

can be effective to other devices

it’s pretty big

like measured in hundreds of meters

so that’s kind of hard to design and keep

those where they are works really good for IoT

works really good for low data rate devices

older devices

it can’t do anything else.

of course they’re going to be in there

then we look and zoom in on the 5

now in this view we took out the UNI2b

because it’s really not part of what we’re going to do

and there’s no uniform because it hasn’t been

ratified yet

this is our current set

we have about 25 20MHz channels

11 40MHz channels

but only 5 AP megahertz channel

so we don’t get a lot of 80 MHz going on

today in the 5Ghz space

unless your home or our small office is very

far away from any neighbors

we stick in the 40s and again the rule

use the widest channel you can until you can’t

how do you know you can’t

you know when you get a conference

so if you have cochannel interference

go to a smaller channel

and then we can zoom out and see this

big 6 GHz

6 GHz has lots and lots of frequency

59 20MHz channels to play with

this is huge

29 40s

we can go to 40s and not hitting cochannel interference

and most buildings anywhere

in fact was 14 in the U.S.

at least with 14 80 MHz channels

that’s fantastic

that’s his that’s you know

more than we’re getting right now with our 40s

so 80 is going to be the new 40 moving on the 6 gig

we still don’t have six gig shipping out yet

but as you compare these six gig is going

to be the future of where we’re going

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